NCIt Definition: A broad category of disorders characterized by an impairment to the intelligence an individual possesses. These impairments can result from trauma, birth, or disease and are not restricted to any particular age group.

MSH Definition: Subnormal intellectual functioning which originates during the developmental period. This has multiple potential etiologies, including genetic defects and perinatal insults. Intelligence quotient (IQ) scores are commonly used to determine whether an individual has an intellectual disability. IQ scores between 70 and 79 are in the borderline range. Scores below 67 are in the disabled range. (from Joynt, Clinical Neurology, 1992, Ch55, p28)

HPO Definition: Subnormal intellectual functioning which originates during the developmental period. Intellectual disability, previously referred to as mental retardation, has been defined as an IQ score below 70. [HPO:probinson]

This term should be used for children at least five years old. For younger children, consider the term Global developmental delay (HP:0001263).

HPO

MDA

19990101

MSH

MESH_DEFINITION

Subnormal intellectual functioning which originates during the developmental period. This has multiple potential etiologies, including genetic defects and perinatal insults. Intelligence quotient (IQ) scores are commonly used to determine whether an individual has an intellectual disability. IQ scores between 70 and 79 are in the borderline range. Scores below 67 are in the disabled range. (from Joynt, Clinical Neurology, 1992, Ch55, p28)